<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
<!--    <script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>-->
    <script src="./js/jquery.js"></script>
    <style>
        #box1 {
            width: 100px;
            height: 50px;
        }
    </style>

    <script>
        $(function () {
            $("#box1").mousedown(function (event) {
                console.log("box1 mousedown");
            })
        })
    </script>
</head>
<body>

<div id="box1">
    哈哈哈
</div>

</body>
</html>